/*
 * Copyright 2015 泛泛o0之辈
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package cn.jfast.framework.web.aop;

import cn.jfast.framework.jdbc.db.ConnectionFactory;
import cn.jfast.framework.web.annotation.Aop;
import cn.jfast.framework.web.api.ApiInvocation;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.sql.Connection;
import java.util.List;

/**
 * 事务管理拦截器
 */
@Aop(scope = AopScope.Method)
public class TransactionAopHandler implements AopHandler {

    private Connection conn;

    public void beforeHandle(ApiInvocation invoke, HttpServletRequest request, HttpServletResponse response, List<Exception> ex) throws Exception {
        conn = ConnectionFactory.getThreadLocalConnection();
        if (null != conn && !conn.isClosed() && conn.getAutoCommit() == true) {
        	conn.getMetaData().supportsTransactionIsolationLevel(Connection.TRANSACTION_READ_COMMITTED);
        	conn.setTransactionIsolation(Connection.TRANSACTION_READ_COMMITTED);
            conn.setAutoCommit(false);
        }
        invoke.invoke();
    }

    public void afterHandle(ApiInvocation invoke, HttpServletRequest request, HttpServletResponse response, List<Exception> ex) throws Exception {
        if (null != conn && !conn.isClosed() && conn.getAutoCommit() == false) {
            if (null == ex || ex.isEmpty()) {
                conn.commit();
            } else {
                conn.rollback();
            }
            conn.setAutoCommit(true);
            conn.close();
        }
        invoke.invoke();
    }

}
